well there is also the just buying a better camera from the get go and NO mod's needed
I have run trail camera's since the 90's
I have only had maybe 3 get ruined from rain/snow getting in them, and have NEVER had one get sun damaged, but don't live in a super hot dry area, and I try to NOT place my cam's where they get tons of sun, due to glare and well they stand out and some how grow legs when more visible to crooks!
I have camera's from 25 bucks up too, but most were higher end camera's and ALL my cam's run 24/7/365 till they die or get stolen
most are 2-3+ yrs old,
I have had some camera's for 7+ yrs and still working as well, and never a water issue?

IF a camera does get damaged from water, many time,s sticking them in a container full of dry rice for a few days or more, will suck all moisture out of them and get them back up and running!

NOTHING wrong with making a cover too i am sure, maybe share more on HOW TO do so?? materials used and ??